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The performance benefits of Multiple Input Multiple Output (MIMO) antenna systems in increasing the throughput of a communication system depends on the type and quality of the information sent to the transmitter. In this paper, the authors examine the loss in throughput due to a delay in receiving information at the transmitter. Specifically, they examine the impact on the throughput when the channel has a delayed channel matrix estimate, as well as when delayed channel statistical information is provided. Additionally, the effect of both delayed transmit and receiver channel state information is explored. The performance is examined using measured data in several environments.
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